Rotary pump



Jan. 24, 1928.

L. A. sPRAeuE ROTARY PUMP Filed Aug. 27. 1923 2 Sheets-Sheet 1 \3 QKCM M a I n! Q,

gh'wenioz Loo/oer cas m w Jan. 24, 1928.

A. SPRAGUE ROTARY PUMP Patented Jan. 24, 1928.

UNITE D? ESTATESJPATENT 20 ERIC Loosen. SPRAGUE, or MILWAUKEE, IWISGONSIN, ASSIGNOB, T0 THOMAS atsrnaenn,

or nnrnorr, mcnremv;

ROTARYiPUIVLP. i

Application filed hugust 27;:1923. Serial No. 659,627. l"

The application relates: v to rotary :pumps r and has ainongits objectsthe provision :of

a rotary pump having an unbroken suriace Withvvhich 'the bucket blades contactgtherew by securing 'less and'vmore .evenly-udistrib-j:

uted Wear; theprovision of a rotary; pump in Whichthe casing for the rotor comprisesa main sectionwhichhas a chamberfor the rotor and :a bifurcated passageway, and :end

sections each of Which has xa' passageway connecting into the chamber and also into one otthe branch passageways oimthe ebi-v fureated passageway; the provision of a retary pump having a liner provided with con centric *inner and outer cylindrical Walls";

the provision of an eccentric liner which is rotatably adjustable to secure: the liquid seal between the bucketsand the liner'and to re establish thisseal in case of W831? of the liner; the provision of a rotary pump hav-- ing shrouds at the ends tofthe pockets in the rotor for increasingthe distance between the open portions of the adjacentxpocketsi:

along" the surfacesofi oontact-betweennthe rotor ends and the end heads and :1colnse-=' is securedandrat the same timeiendwisea movement of the pinswwithr consequent cone tact with andiscoring of the cylindeinheads and lservlng toadecrease the leakage passing is prevented. Other obje'cts of the invention reside 'in providing arotary pumpmhaving means for predetenminedlyadjusting one of the cylinder heads relative to the cylinderto provide a predeterminedv clearance abetween the cylinder. head andethe 1 adjacent,

end "of. the rotor and also in the novel: rem

tures of construction and combinations. of;

parts asiwili more' fully hereinafter "wappearuz:

In the drawings:

Figure 1 is a SEClLlQDEtl' end aelevationaotrav rotary pump embodying my invention;-;c;

Figure 2*is aasegtional plan view thereof; Figurei'iifisa cross sect1on on the l ne 3+3E-- of Figure 1;;

a cylinder headremovedr The casing of the rotary pumpflcomprises' the mainsection orzcylin-der lfland the end ebearings and turthermore the bucket-a pine; v {are held- ;f-r01nf contaotlngnvith rand scoringvi.

to the ends ofthe cylinderbythe cap bolts" 3 i. The :cylinder has the .WEItQIPlIllG'C and outlet passageways?) and 6 at opposite sides,v

each being bifurcatedrto .form wbranch pas I sag sways 'leadingto a the endsrofthe cylin-xeo der. The cylinderi'heads 2 and ;3: each haverzn" reverselycurved passageways '7 and 81 0011- necting respectively into the branch xpas-"ar; sagevvays of the inletpassagewayt and :Olli'i the outletypassageway Gland alsoclonnectingves intoythe chambelwformed Within the cyliIi-n'i; der and Within whichthe rotor 9 is located-9 The cross%sectional: areas and :curvaturesuofrr i the passageways'in both the cylinder sandy cylinder headsar e such thatfthe velocityaofa the Water passing through the pump is changed gradually therebyv aincreasingg 'the efliciency of the pump. i p The rotor9is providedrrvitlrthe angularlyv spaced longitudinallvextending pocketsilO in its peripherywinwhich {are engageable the buckets-L11 pivotally ymountedi. upon them tor. iEacl'i bucket' has the blade l-Qvandfihe arms 13 extending "from the bladewnear its opposite ends, these arms having hubs'l leiene gageab1ein recesses 15 formed-inwthe IQtOlffA" 1 near the opposite ends-thereof.-t The ihubsisa." 14 are fixedlyrseoured upon theendsofthe ;pin1 16" by the key 17, thisp'i-n extending; through and rotatably mounted: in thatripon tion' of the rotoiv Tbe-tween'the 1 recesses 1: 15.

10' are shrouds, attthe ends of the pockets 5 Q10 and terminating nearthe blades, l2,these:a.-;

shrouds substantially enclosin'githe arms -13' between the open portions oii the adjacent pockets: ":.,Withi this arrangement-,2 :the l life {got the rotary pumpuisiincreased by reason 31;:

of the :buclret'pinsrotating .in the larger ihaving eccentrioinner and outer; cylindrical walla; This liner is-i-provi c led vvith the longitudinallysexten ding lgeywayst lfl vvhieh tare 1.

ifiilgagfiablfiLlllpb}? a key 2Qtengagingimthe seotionswor cylinden-heads e2;- andta, seeuredzrkeyway '21: injuhe cylinder; she arraageinentwno being such that as the inner wall of the liner wears, or for any reason the liquid seal is not secured, the liner can be rotatably adjusted after removing the key to bring another of its keyways into registration with the keyway in the cylinder after which the key can be re-engaged. Vl ith this arrange nessot the liner being the same but its eccentricity being different. With this arrangement the rotary pump, by using dif-' ferent liners, may be adapted to difierent conditions of speed, capacity and power. A liner having an outer cylindrical wall of the same. diameter as that of the liner 18 but having an inner wall of different diameter than that of the liner 18 is indicated by the reference character 22 in Figure 4. This liner 22, as well as the other liners, has the same minimum thickness of wall oppo site the key 20 so that only the maximum clearance between the rotor and the inner cylindrical wall of each liner is varied.

The shaft 23 upon which the rotor 9 is secured extends outwardly through the cylinderheaols 2 and 3 and is journalled there- 1n. The arrangement of packing and antitriction hearings in each cylinder head is the same and therefore the arrangement within the cylinder head 3 will be described. 2 1

is suitable packing surrounding the shaft 23 and surroundedlby the smaller cylindrical fiange25 of the cylinder head 3. 26 is a cupshaped gland surrounding the shaft 23 and having a reduced inner end abutting the outer end of the packing 24 for co1i1pressmg the same and holding it in place. Locatedwithin the enlarged end oi the gland 26 is the anti-friction bearing'27, the inner race of which is engaged by the shaft 23. 28 1s a cover plate secured to the outer end of the gland and surrounding the shaft for inclosing the spacewithin the gland. This gland is telescopicallymounted in the main or larger outwardly extending cylindrical flange 29 of the cylinder head andissecurcd thereto by suitable means such as the cap bolts 30. With this arrangement it will be seen that the gland in each cylinder head carries an anti friction bearing,supporting the rotor shaft and also compresses and holds the packing surrounding the shaft in place. i a

For. the purpose of predeterminedly adusting the clearance between the cylinder heads and the ends of the rotor, I have provided means for predeterminedly adjusting the cylinder 119 a a relative t the cyl n 1. This comprises the adjusting or set screws 31 threadedly engaging in the cylin- 'dor head 3 and adapted to abut against the cylinder 1. These adjusting or set screws preferably having notched heads. the notches of which are engageable in by locking pins 32 upon the cylinder head In assembling the cylinder head 2 is secured permanently in place. Thecylinder head 3 is then placed against the end of the cylinder 1 with the gasket ordinarily used therelwtwcen removed. The adjusting or set screws are next turned until they abut the cylinder,

after which each is turned a sullicient distance to permit of the entrance of its lockmg p n into the succeeding notch in lts head.

The cylinder head is then removed and the gasket 33 applied to the end oi the cylinder after which the cylinder head is again applied and tightened in place by the cap bolts 4 until the adjusting or set screws abut against the cylinder head, the packing be ing compressible to permit of the necessary movement of the cylinder head toward the cylinder. This provides a predetermined clearance between the cylinder heads and the ends of the rotor.

F or the purpose of providing buckets in which the portions engageable with the liner can be easily replaced in case ofwear hnd also for the purpose of providing buckcts oilering less friction and having better wear resisting qualities than the materials suitable for the main portions of the buckets, I provide the buckets with detachable tips 34: preferably formed of lignum vitae, this material having good lubricating properties,

being non-corrosive and performing satisfactorily under high bearing pressures. hat I claim as my invention is:

1. In a. rotary pump,the combination with the rotor provided with longitudinally-em tending pockets in its periphery and shrouds at the ends of said pockets, of a bucket engageable in each of said pockets, each of the said buckets having an arm portion SlllJ.

stantially entirely enclosed by its respective shroud. i

2. In a rotary pump, the combination with the rotor provided with longitudinally-en tending pockets in its periphery, of buckets pivotally mounted upon said rotor and on gageable in said pockets and integral shrouds upon said rotor andat the ends oi said pockets, said' shrouds partially inclosing said buckets.

7 3. In a rotary pump, the combination "with the rotor provided with a. longitudinally-extending pocket in its periphery having rccesses near its opposite ends and with shrouds between said recesses and the rotor ends, of a pin rotatably mounted in said rotor and having its ends extendin into said recesses, and a bucket engageable in said pocket andhaving arms extending into said recesses and detachably secured upon the ends of said pin.

4;. In a rotary pump, the combination with the rotor, of a casing comprising a cylinder surrounding said rotor and cylinder heads detachably secured to said cylinder and carrying said rotor, and means for predeterminedly adjusting one of aid cylinder heads relative to said cylinder to provide clearance between said cylinder headand the adjacent ends of said rotor.

5. In a rotary pump the combination with a rotor, of a. casing comprising a main section formed with a rotor chamber opening in opposite ends of said section, said section being further formed withan inlet and an outlet passage at opposite sides of the rotor chamber, said passages openingin one of said ends, said casing further comprising an end section journaling said rotor, and having passages, establishing communication between said passages of the main section and the rotor chamber.

6. In a rotary pump the combination with a rotor provided with buckets, of a casing formed with a chamber receiving saidrotor and having supply and delivery passages opening endwise into said rotor chamber, and a liner for saidchamber rotatively adjustable therein and having its opening eccentric to its outer wall, the said liner forming a bearing for sa1d buckets.

7. In a rotor pump, the combination with j a rotor and a cylinder chambered to receive said rotor, of a liner fitted within said chamber having its rotor receiving opening eccentric to its outer wall, and means including a longitudinally extending key for keying said liner to the casing in selective positions of rotative adjustment.

8. In a rotary pump, a rotor formed with a longitudinally extending peripheral pocket, and having apair of longitudinally aligned recesses opening into said pocket spaced from each other and fromthe ends of the rotor, a bucket radially movable in said pocket, arms mounting said bucket terminally forming bearings journaled in said recesses, and a pin extending lengthwise through the rotor retaining said bearings in said recesses.

9. In a rotary pump, the combination with a rotor chamber having a longitudinally extending keyway, of an adjustable liner for said chamber, the said liner being provided with a longitudinally extending keyway, and a key enga-geahle in the said keyways for locking the liner within the chamber.

In testimony whereof I afiix my signature.

' LOCKE A. SPRAGUE. 

